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Question

The system of linear equations x + y + z = 6, x + 2y + 3z = 10, x + 2y + 2z = 4 will have


A

non trivial solution

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B

trivial solution

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C

infinite solutions

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D

no solutions

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Solution

The correct option is A

non trivial solution


Once you express the given equations in the form of matrices then the determinant D = 1, D1 = 8, D2 = 8, D3 = 6. Here D ! = 0, none of D1, D2, D3 are zeros. So according to Cramer's rule there exists non trivial solutions and the solutions being x = D1D, y = D2D, z = D3D


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